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buildDhallUrl: Respect proxy environment variables
`buildDhallUrl` is a fixed output derivation, which means that we can (and should) inherit impure proxy-related environment variables for fetching URLs. The motivation for this change is: https://discourse.dhall-lang.org/t/cant-build-a-nixified-dhall-package-in-a-sandbox-depending-on-the-environment/ … where a `buildDhallUrl` derivation was failing in a restricted networking environment due to not inheriting proxy-related settings.